Your media player basically assumes that you want to listen to all your music and such will play all your music until you tell it otherwise. I've not found anyway to change this behavior under any of the choice lists and I do not believe it is possible. I have not upgraded my Curve as yet so yours likely did it before you upgraded, maybe as you said the Pearl was different.
I haven't tried it, but I don't think putting your music into individual folders will help. If the song is listed, it's going to play it ........... simple as that.
__________________ Regards, Jag "Torch 9810 + Playbook 64gb"